Controlling fuel delivery during transient engine conditions

A system for determining and controlling the fuel mass to be delivered to an individual cylinder of an internal combustion engine during engine transients compensates for fuel transport dynamics and the actual fuel injected into the cylinder. A plurality of engine parameters are sensed, including cylinder air charge. An initial base desired fuel mass is determined 100, based on the plurality of engine parameters. An initial transient fuel mass is also determined 110, based on the prior injection history for that cylinder. A desired injected fuel mass to be delivered to the cylinder is then determined 112, based on the initial base desired fuel mass and the initial transient fuel mass. These same calculations are then used to compensate for changes to the base desired fuel mass while the fuel injection is in progress, resulting in an updated desired injected fuel mass 124. Finally, the injection history for that cylinder is updated 128 to account for the actual desired fuel mass delivered to the engine.